Thermodynamic evidence for the formation of a Fulde-Ferrell-Larkin-Ovchinnikov phase in the organic superconductor λ−(BETS)2GaCl4
S. Imajo, T. Kobayashi, A. Kawamoto, K. Kindo, Y. Nakazawa
DOI 10.1103/PhysRevB.103.L220501 · Physical Review B
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Abstract
In this work, the thermodynamic properties of the organic superconductor λ−(BETS)2GaCl4 are investigated to study a high-field superconducting state known as the putative Fulde-Ferrell-Larkin-Ovchinnikov (FFLO) phase. We observed a small thermodynamic anomaly in the field HFFLO∼10 T, which corresponds to the Pauli limiting field HP. This anomaly probably originates from a transition from a uniform superconducting state to the FFLO state. HFFLO does not show a strong-field angular dependence due to a quasi-isotropic paramagnetic effect in λ−(BETS)2GaCl4. The thermodynamic anomaly at HFFLO is smeared out. and the low-temperature upper critical field Hc2 changes significantly if fields are not parallel to the conducting plane, even for a deviation of ∼0.5∘. This behavior indicates that the high-field state is very unstable, as it is influenced by the strongly anisotropic orbital effect. Our results are consistent with the theoretical predictions on the FFLO state and show that the high-field superconductivity is probably an FFLO state in λ−(BETS)2GaCl4 from a thermodynamic point of view.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| λ-(BETS)2GaCl4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5 | Pressure not reported | onset |
| λ-(BETS)2GaCl4 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5 | Pressure not reported | onset |
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